Stuttgarter Beiträge Zur Naturkunde Serie a (Biologie)
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ZOBODAT - www.zobodat.at Zoologisch-Botanische Datenbank/Zoological-Botanical Database Digitale Literatur/Digital Literature Zeitschrift/Journal: Stuttgarter Beiträge Naturkunde Serie A [Biologie] Jahr/Year: 2004 Band/Volume: 659_A Autor(en)/Author(s): Cerretti Pierfilippo Artikel/Article: A new species of Pseudogonia Brauer & Bergenstamm from Sardinia, and a key to the West Palaearctic species (Diptera: Tachinidae) 1-11 A 659 24.03.2004 14:10 Uhr Seite 1 Stuttgarter Beiträge zur Naturkunde Serie A (Biologie) Herausgeber: Staatliches Museum für Naturkunde, Rosenstein 1, D-70191 Stuttgart Stuttgarter Beitr. Naturk. Ser. A Nr. 659 11 S., 17 Abb. Stuttgart, 13. IV. 2004 A new species of Pseudogonia Brauer & Bergenstamm from Sardinia, and a key to the West Palaearctic species (Diptera: Tachinidae) PIERFILIPPO CERRETTI Abstract A new species of Pseudogonia (P. metallaria n. sp.) from south-west Sardinia (Italy) is de- scribed and illustrated. It is related to P. parisiaca (Robineau-Desvoidy, 1851) and P. valens (Richter, 1974). Its position in the genus is discussed. A revised key to West Palaearctic Pseu- dogonia is presented. Keywords: Tachinidae, taxonomy, Pseudogonia, new species, Sardinia, Italy, identification key. Zusammenfassung Eine neue Art von Pseudogonia (P. metallaria n. sp) aus Süd-West-Sardinien (Italien) wird beschrieben und illustriert. Sie ist verwandt mit P. parisiaca (Robineau-Desvoidy, 1851) und P. valens (Richter, 1974). Ihre Stellung innerhalb der Gattung wird diskutiert. Ein überarbeiteter Bestimmungsschlüssel für die westpäläarktischen Pseudogonia wird vorgestellt. Contents 1 Introduction . 1 2 Methods . 2 3 Taxonomy . 3 3.1 The Pseudogonia parisiaca-group . 3 3.2 Pseudogonia metallaria n. sp. 3 3.3 Comparative notes . 7 3.4 Key to the West Palaearctic species . 9 4 References . 9 1 Introduction Pseudogonia Brauer & Bergenstamm, 1889 is a genus found in the Afrotropical, Palaearctic, Oriental and Australian regions (CROSSKEY 1973, 1976, 1980; HERTING 1984), belonging to the large and multiform tribe Goniini (sensu HERTING 1984; A 659 24.03.2004 14:10 Uhr Seite 2 2 stuttgarter beiträge zur naturkunde Ser. A, Nr. 659 WOOD 1987) which is characterised by completely incubated microtype eggs that hatch, only after having been swallowed, inside the host’s mesenteron (WOOD 1987). Up until now, six species of the genus Pseudogonia were known: P. fasciata (Wiedemann, 1819), an Afrotropical species that reaches also the Canary Islands (CROSSKEY 1980; HERTING 1984) and Spain (TSCHORSNIG et al. 1997); P. madas- cariensis Villeneuve, 1915 from Madagascar (CROSSKEY 1980); P. parisiaca (Robineau-Desvoidy, 1851), a Palaearctic species, widespread in central-southern Europe (reaching southwards to Corsica and Sicily), Central Asia and southern Siberia (HERTING 1984); P. rufifrons (Wiedemann, 1830), a subcosmopolitan species found in the Afrotropical, Palaearctic, Oriental and Australian regions (CROSSKEY 1973, 1976, 1980; HERTING 1984; CHAO 1999); P. suspecta Villeneuve, 1915 from Madagascar (?) (CROSSKEY 1980); P. valens (Richter, 1974), from Mongolia and Chi- ta (southern Siberia) (RICHTER 1974, 1980; HERTING 1984). In the present paper a new species of Pseudogonia from south-west Sardinia is described. Data on the biology are available only for P. parisiaca, an oligophagous parasite of Arctiidae (Lepidoptera), and for P. rufifrons, also oligophagous, but of Noctuidae (Lepidoptera) (cf. HERTING 1960; CROSSKEY 1976; TSCHORSNIG & HERTING 1994). Acronyms CNBF Centro Nazionale per lo Studio e la Conservazione della Biodiversità Forestale – Corpo Forestale dello Stato (Verona, Italy) CNC Canadian National Collection (Ottawa, Canada) MZUR Museo di Zoologia, Università di Roma “La Sapienza” (Roma, Italy) PC Collection of P. CERRETTI (Verona, Italy) SMNS Staatliches Museum für Naturkunde (Stuttgart, Germany). Acknowledgements This paper was prepared within the CONECOFOR programme, by contract with the Ministry for Agriculture and Forestry Policies – National Forest Service, Italy. CONECO- FOR is part of the Pan-European Level II Intensive Monitoring of Forest Ecosystems and is co-sponsored by the European Commission. I would like to thank all those that have enabled me to write this work, in particular my friends and colleagues FRANCO MASON, GIANLUCA NARDI, MARA TISATO and DANIEL WHITMORE (Verona) for their help during field work and their precious advice during the writing of the text; DANIEL WHITMORE for the improvement of the English; HANS-PETER TSCHORSNIG (Stuttgart), my patient teacher in tachinidology, for the information supplied and the critical revision of the manuscript; BERNHARD MERZ (Genève) for the critical revision of the manuscript; MAURIZIO ZILLICH and FRANCO MASON (Verona) for making the research work in Sardinia possible; GIAMPIETRO MAZZONI (Verona) for the etymology of metallaria; lastly, BRUNO PETRICCIONE (Roma), Italian coordinator of the CONECOFOR programme. 2 Methods The dissection of the male terminalia was done following the method described in detail by O’HARA (2002). The dissected male terminalia are preserved in glycerol in a small plastic tube and pinned together with the specimen. The illustrations were done using a Leica DMLS op- tic microscope (terminalia) and a Leica MZ 7.5 stereoscopic microscope (head). The pho- tographs of the abdomen and the measurements were done using Leica IM 1000. Terminology of the external morphology (other than male terminalia) follows MERZ & HAENNI (2000), except for antenna that follows STUCKENBERG (1999), that of male terminalia follows SINCLAIR (2000). Measurements and ratios of head follow TSCHORSNIG & RICHTER (1998). A 659 24.03.2004 14:10 Uhr Seite 3 cerretti, pseudogonia from sardinia 3 3 Taxonomy 3.1 The Pseudogonia parisiaca-group The P. parisiaca species-group includes three species (P. parisiaca, P. valens and P. metallaria n. sp.), which share a number of common characters and may form a monophyletic group: – Head black in ground colour; – ( with proclinate orbital setae (Figs. 1, 10); – Second aristomere relatively short, 3–6 times as long as the third aristomere (Figs. 1, 2, 10); – Setulae on parafacial shorter than frontal setae (Figs. 1, 10); 1 – Surstylus long, at least as long as /2 of the syncercus (Figs. 4, 5) (RICHTER 1974: 404, figs. 5, 6). 3.2 Pseudogonia metallaria n. sp. Material Holotype (: Italy, Sardinia, Cagliari prov., Iglesiente, Domusnovas, Valle d’Oridda, ca. 300 m a. s. l. (N 39.41312, E 8.61295), 4.IX.2003, P. CERRETTI, M. TISATO, D. WHITMORE leg. [MZUR]. Paratypes: 1&, ditto 4.IX.2003 [SMNS]; 1 (, ditto 5.IX.2003 [CNBF]; 2 && , ditto 5.IX.2003 [CNC, PC]. All the specimens were swept in the morning from flowers of Euphorbia pithyusa cupanii (Guss.) A. R. Sm. (Euphorbiaceae). Etymology From the Latin metallaria, meaning miner, in reference to the landscape in which the spec- imens were caught. The area is indeed deeply transformed by mining activities that, in the Iglesiente region, are of ancient origin, so much so that the word metalla (= mine), from which the adjective metallaria derives, was used by the ancient Romans in regard to the Sardinian mines. Diagnosis Head black with grey microtrichosity except on vertex and posterior half of fron- to-orbital plate which is shiny black. Palpus black. Scutellum entirely black. Inner border of lower calypter black. (: Abdominal tergites 3 and 4 shiny black with a 1 transverse basal band of weak microtrichosity on at most /2 of the length of each segment; the bands are interrupted medio-dorsally showing a broad black longitudi- nal stripe on tergites 3 and 4; abdominal tergite 5 shiny black. &: Abdomen entirely shiny black. Description Male (measurements in square brackets refer to the holotype): Length: 6.5-[7.5] mm. Colour. Head black with grey microtrichosity except on vertex and posterior half of fronto-orbital plate which are shiny black; scape and pedicel dark brown, post- pedicel black; palpus black. Thorax and legs black; scutum very weakly microtri- chose; presutural area with four longitudinal dark vittae (the lateral pair sub-trian- gular); legs without microtrichosity. Lower calypter white with black inner margin; A 659 24.03.2004 14:10 Uhr Seite 4 4 stuttgarter beiträge zur naturkunde Ser. A, Nr. 659 Figs. 1–3. Pseudogonia metallaria n. sp., (. – 1–2. Head (holotype). 3. Sternite 5 in ventral view (paratype). – Scales: 1 mm for Figs. 1–2, 0.5 mm for Fig. 3. A 659 24.03.2004 14:10 Uhr Seite 5 cerretti, pseudogonia from sardinia 5 upper calypter white. Wing hyaline; tegula and basicosta black, veins black or dark brown. Abdomen (Fig. 16) black; tergite 3 with a transverse band of very weak mi- 1 1 crotrichosity on anterior /4– /3 dorsally; tergite 4 with a transverse band of weak 1 microtrichosity on anterior /2; tergite 5 shiny black without microtrichosity. The transverse bands of microtrichosity on abdominal tergites 3 and 4 are interrupted medio-dorsally showing a broad longitudinal black stripe. Terminalia black. Head (Figs. 1, 2). Eye bare. Arista bare, thickened nearly to apex. First aristomere as long as wide; second aristomere about 4–6 times as long as its diameter, 0.3–[0.6] times as long as third aristomere. Postpedicel about [3.4]–4.1 times as long as pedi- cel. Frons at its narrowest point [1.4]–1.5 times as wide as an eye in dorsal view. Ocellar setae well developed, reclinate or lateroclinate. Medial vertical setae strong, reclinate, sub-parallel (from each other). Lateral vertical setae well developed, late- roclinate. 1–3 reclinate, or lateroclinate, upper orbital setae; 1 proclinate orbital seta. 7–9 frontal setae descending to the level of the base of the arista or slightly lower. Fronto-orbital plate with one row of strong medioclinate setae lateral to the row of frontal setae. Parafacial with two rows of setae. Parafacial (in lateral view) at its nar- rowest point [0.6]–0.7 times as wide as the postpedicel. Face not visible in lateral view. Lower facial margin well visible in lateral view. Vibrissa well developed, aris- ing above level of lower facial margin. Facial ridge with decumbent setulae on lower 1 1 /5– /4.